1. I'm not really sure how servitor share (83 skill) works. It should boost summons's stats really badly and from what I see it does not. When I cast it my pony's stats remain the same and I can't see it on pony's buffs bar, which is kinda weird. Any explanation here?
2. Which things are being shared with summons? Buffs for sure, elementals (both in weapon and in armor) too. What else? Will epics like zaken affect my pony too? How about passive augments or passive skills enchant?
Epic and passive augment - don't give effect to suumon.
You need boost your stats like p.def, p.atak, m.def, haste etc. It's weapon/armor/jew enchant, skills what got this stats etc, tatoo and other.